Is it possible to make the HTC One m8 for Windows louder?

I just upgraded from the lumia 920 to the HTC One m8 for windows. To be honest, I really miss a lot of things about the 920. I miss the built in search button so I didn't have to turn on the phone to use Cortana, I miss the power button on the side of the phone, and I majorly miss the glance screen. Although I miss those things they don't matter too much to me.

However, one main reason I got the HTC One m8 was for the loud speakers. I have a 45 min. commute with no sound system in my car, so I always used the 920 for audiobooks (with audible) during my drive. The only time I couldn't hear the 920 was when it was raining out, but I can hardly hear the HTC One m8 in regular conditions.

Is there any way to boost the sound (for audiobooks)? Is this possibly just an issue with the Audible app?